au.\*:("VLETTER DR DE")
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ZAMBIA'S MINERAL INDUSTRY AND ITS POSITION AMONGST WORLD'S MAJOR COPPER PRODUCERS.VLETTER DR DE.1972; GEOL. EN MIJNBOUW; NLD; 1972, VOL. 51, NUM. 0003, P. 251 A 263Miscellaneous
MINERAL DEVELOPMENT IN SWAZILAND AND THE ROLE OF THE GEOLOGICAL SURVEY AND MINES DEPARTMENT.DE VLETTER DR.1976; COMMONW. GEOL. LIAISON OFF., LIAISON REP.; G.B.; DA. 1976; NO 126; PP. 87-106; BIBL. 2 P.; (SEM. HEADS GEOL. SURV. COMMONW. CTRIES AFRICA; 1976)Conference Paper
INCREASED RESPONSIBILITIES OF GEOLOGICAL SURVEYS AND MINES DEPARTMENTS IN DEVELOPING COUNTRIESDE VLETTER DR.sdUTILISATION OF MINERAL RESOURCES IN DEVELOPING COUNTRIES CONFERENCE/1977/LUSAKA; II. GEOLOGY; ZMB; S.L.: ENGINEERING INSTITUTION OF ZAMBIA; DA. S.D.; 37 P.; BIBL. 5 P.Conference Paper
COMO SE FORMO EL MINERAL DE NIQUEL CUBANO. UNA LECCION SOBRE GENESIS DE LAS LATERITAS = COMMENT SE FORME LE NICKEL CUBAIN. UNE LECON SUR LA GENESE DES LATERITESDE VLETTER DR.sdIN: METAL. EXTR. MINER. OXIDADAS NIQUEL; LA HABANA INST. CUBANO LIBRO ,1972, P. 9 A 19Book